Starting a new world
1. Login to the Control Panel
2. Select servers
3. Click My Servers (left side of screen)
4. Click on your server
5. At the top is the start/stop/restart buttons
6. Stop your server
7. In the World box, type in a new world name
8. Click the save button
9. Start your server
To return to your default world, stop your server and leave the World box blank, this will load the default world, then start your server.